File:  [gforth] / gforth / kernel / quotes.fs
Revision 1.12: download - view: text, annotated - select for diffs
Mon Dec 31 18:40:26 2007 UTC (13 years, 8 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright notices for GPL v3

    1: \ quote: S" and ." words
    2: 
    3: \ Copyright (C) 1996,1998,1999,2002,2003 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation, either version 3
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program. If not, see http://www.gnu.org/licenses/.
   19: 
   20: \ this file comes last, because these words override cross' words.
   21: 
   22: require ./vars.fs
   23: 
   24: : CLiteral ( Compilation c-addr1 u ; run-time -- c-addr )
   25:     2>r postpone ahead here 2r> s, >r postpone then
   26:     r> postpone literal ; immediate restrict
   27: 
   28: : SLiteral ( Compilation c-addr1 u ; run-time -- c-addr2 u ) \ string
   29: \G Compilation: compile the string specified by @i{c-addr1},
   30: \G @i{u} into the current definition. Run-time: return
   31: \G @i{c-addr2 u} describing the address and length of the
   32: \G string.
   33:     tuck 2>r postpone ahead here 2r> chars mem, align >r postpone then
   34:     r> postpone literal postpone literal ; immediate restrict
   35: 
   36: \ \ abort"							22feb93py
   37: 
   38: : abort" ( compilation 'ccc"' -- ; run-time f -- ) \ core,exception-ext	abort-quote
   39: \G If any bit of @i{f} is non-zero, perform the function of @code{-2 throw},
   40: \G displaying the string @i{ccc} if there is no exception frame on the
   41: \G exception stack.
   42:     postpone if [char] " parse postpone cliteral postpone c(abort")
   43:     postpone then ; immediate restrict
   44: 
   45: \ create s"-buffer /line chars allot
   46: has? compiler 0= 
   47: [IF] : s" [ELSE] :noname [THEN]
   48: 	[char] " parse
   49: [ has? OS [IF] ]
   50:     save-mem
   51: [ [THEN] ]
   52: ;
   53: \    	/line min >r s"-buffer r@ cmove
   54: \    	s"-buffer r> ;
   55: has? compiler [IF]
   56: :noname [char] " parse postpone SLiteral ;
   57: interpret/compile: S" ( compilation 'ccc"' -- ; run-time -- c-addr u )	\ core,file	s-quote
   58:   \G Compilation: Parse a string @i{ccc} delimited by a @code{"}
   59:   \G (double quote). At run-time, return the length, @i{u}, and the
   60:   \G start address, @i{c-addr} of the string. Interpretation: parse
   61:   \G the string as before, and return @i{c-addr}, @i{u}. Gforth
   62:   \G @code{allocate}s the string. The resulting memory leak is usually
   63:   \G not a problem; the exception is if you create strings containing
   64:   \G @code{S"} and @code{evaluate} them; then the leak is not bounded
   65:   \G by the size of the interpreted files and you may want to
   66:   \G @code{free} the strings.  ANS Forth only guarantees one buffer of
   67:   \G 80 characters, so in standard programs you should assume that the
   68:   \G string lives only until the next @code{s"}.
   69: [THEN]
   70: 
   71: :noname    [char] " parse type ;
   72: :noname    [char] " parse postpone sLiteral postpone type ;
   73: interpret/compile: ." ( compilation 'ccc"' -- ; run-time -- )  \ core	dot-quote
   74:   \G Compilation: Parse a string @i{ccc} delimited by a " (double
   75:   \G quote). At run-time, display the string. Interpretation semantics
   76:   \G for this word are undefined in ANS Forth. Gforth's interpretation
   77:   \G semantics are to display the string. This is the simplest way to
   78:   \G display a string from within a definition; see examples below.
   79: 

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